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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10182c1c612c9b056fc6437774a4a6c66d0333c265577a713e23db70fb49158' 
  AND token = '+nqVVnO1ywoU8YzykSF65aE7fbyk9pndB4/6Vrau3gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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