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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d96cacb65bfa9092d1f133d9950b8b2d03dfc3a867076b5599bc4fb4228c914' 
  AND token = 'K0/Eeknp3p3GPpwI+kp2AW8b0477QNUZX9g39Ex8bxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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