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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef189131f37ad62eb32ded78ed0593ae9d13b9ba3d65dea5ca409f30c6bfd9c' 
  AND token = 'N73t/0fx6goNlWe7Jt0sv7pvGu+nfDPEKwCGofVVl8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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