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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cda095101788603f179fe678491b5b82ce4c1cb3087e971c0a3cb8655d10d0' 
  AND token = 'o6OzPKTdop6naYtcLXIoe1Up7TDhQuuAJ9rTb1DHS94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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