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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bceb93c14a9ca377c7d31e8e611e998bea623c24b114b4d4dbb0fb021532e43e' 
  AND token = 'HpEk9Sv8ThABtr+yPARvTtBm8pq8590IHPCPPqZIUOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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