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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cea92d453c355d41391d08816c08af5372eae82d94097ed52a1511eb17175f2' 
  AND token = '5WYlKTQboCi2uGNSnxzdiRgAUC2cA5qBS8StnQzfk7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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