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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b587a5bc3383b52e411b3330443060ed6b4c15caca8e9bd2b0a9e4cba5cf99c' 
  AND token = 'mou2A+3UfgSzrINNMGtGhcbFeI91EQqGROgpFTD+z0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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