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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcec09e008a44d79227093e592b2983f2ae169636f142b2582ce6352dfffbf08' 
  AND token = 'NiWj0udwyE4uFqd0Smf/5w3WjDSDR+HqqWkH+AmXVp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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