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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b6581dd8e91bad4e08506992cccc9885cd313eeb69eb929361b7c303176cdf' 
  AND token = 'm/aAiTfBVXPHu38TlXv0/8CEa5bEX2jjWcNbRk5+IhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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