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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f333796b1e2778ae77eb71fa682bdc1c5a51b1fb6aac9ccf1e1cc75d591cdd01' 
  AND token = 'oOvlTOp/kkX3BgwzjnH10+bA6+bDYf6veV+Shdv8J5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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