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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0005bb366b80dbd4f6b7e17cf1297121cefc3c10bbad2244ede1ac0d9dd977f' 
  AND token = '17YVGVZwSAq05cmtqFaDZPl1umtXMtH4A6J0GqqSi90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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