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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b65d5519b9fce0db27e36ab354d4e5ed70902278aae4278b56446dcde7fdbc8' 
  AND token = '8m6cOBWBBIwrNV/RrKTTaJKHjx1zHC60PTaa29noZGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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