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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140bea53c0cf0eff240ed286d571e05f680ade9e3f70bf3573ca1ba1252be0c1' 
  AND token = 'KvcSyA7B2I1YG0ocfq4uSqFRkn389DNt2zDLsFU33Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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