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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26115c69ad6bbeaa2786b19a266be964198555618992a98aa877b8694b539a64' 
  AND token = '5Rg2183//BEIMVXK0QErRVW5MzR3ar3FBQbC+NBWu0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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