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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0bb0704793bbe09d19f8fdb43a20357078cc316f394a8f5aacdda3bb18e5f6a' 
  AND token = 'iyvG3b/uZeE5qv9/2LUZEo6kZGOatpP+Nki66QE4zug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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