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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71332a2381a2d27a51629cfc777a418784cee5e9d00817d2f4d8ea7ec0d49369' 
  AND token = 'PWQsfqDkhEJjnGHBhCIIobWsQ/kJXVM323kclM3gDH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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