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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0c4f9922edb60698cee3483aa65fb2aa2d3b50f08cf9c2a0d46e16a0bc88b8' 
  AND token = 'lYNJcooNNdJjPVWKtItOgiCsY9aft9Iv7OTj1uKlh3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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