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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d686f5f66fed1b132119e5f8c49075b74444d3eea493172b1cd8b23220cce9e' 
  AND token = 'rL/Pvhez8KOTNGD5a4m9EvS9brgstKALKY7y//YQ/Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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