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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d15d68883c6f4c3678e5355ad73e781c21d4437538f03624017dcbd7992159' 
  AND token = 'XaXNgXrCghrOzi4UkVQYFO00oVgs399N1kokXI1LBa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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