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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb38d38b1b4b71acd98a56069da12d2f3d6c94fb650f5f9daa20ba12ae57b940' 
  AND token = 'E4BWz5vbBsQ+sUL+74vDLK4yTYIDPRBZ9AyIOVx6iNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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