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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518ba0d182b900cde8bf97701e5b6a6db8f2a5223acdd8e8716913b1d2b79694' 
  AND token = '4Ab/0DNCyUudrH2MzGN8qhg6EJDPowP8lUR243F9B1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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