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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237cffef98d2651a1dacab60f0928f367e49cdf4c7ce56c295ab7cf376b79236' 
  AND token = 'OjNmO8znFN0Y/vuI6cLb+c1Wkf+l8BEhtD3/DDMW08I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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