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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ad70eb365f92ba18cfa583e70f501b47b189289e79fdb77a0e1d650bb38eb5' 
  AND token = '6o19VuC5e+XvtDeM0Y4E13suiMT+VQZ+2mHe3/grwMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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