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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3324f328d87596aca67156ca44e5b13c1689b3aaccadfe70d57b03c50fc3c8aa' 
  AND token = 'ZLUz28Z8necbrWa+AUa7ljMtU3H1vQU9IejwFmFs310=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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