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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f497f93fde208993dc4a877efdf91bde8c507d0908b2524cdf41dafac4ce55d' 
  AND token = 'itE/H7scWgL9QvRUSRbJInnkGmDJzCS2a3tB/d3KNHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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