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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c8e8678f1c36366dd0da61ecd7ae8f2e9f5d5c168c3b8a2812d2acef9947b1' 
  AND token = 'b96nNcS2IPvmLweRNsfS5Kuc8zoJq9g5tfefPSypkiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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