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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa8fe15a22ecb593fab31e3822bd656b2ac4758a8738a6650d76cc498cefdd7' 
  AND token = 'uPd+7w3+g0Tp2dR/LBzoiDdeD9ndvitzx43OlD+UNBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}