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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb4b4837e1cd0260ca400cf8b906a5c475bd4d412a9bdfe585afa61faa97b66' 
  AND token = 'l4FJOV+N4bN1e3Dy688QY3ubJQwg4Wx9X51wpqj6ql0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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