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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f5dc3e5d8a29b1048325c67b99c732d06a42cefc8a7f48b19c6f08bde8a2d1' 
  AND token = 'I5C19URRNX+TL2+/2saYxyZFE/gdkn4yvW1/kPJ//K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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