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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe6992376aae33c8ea47aaf17b8206b240f6a8ad3674a8a4294ddab3b9ad247' 
  AND token = 'I8w1ccbuQ+5HytZjKUku4O8jxdS30GRXrEufRL8PKFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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