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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a808532182ddabdb8c267fc31e43bf074dc6910a05c0c9b96ca7a4a3af6149f' 
  AND token = 'YcYvvMglc799BZWXIXWujqYcA0+r3YGHK8Wy+zP0v0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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