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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbc439a45dceb4e63465c5c91f97c46806d1a524808c5adefd95735fbcaf8a2' 
  AND token = 'N0x68cQka16l4Q6LSokzItI9IGSpvCT/vNd7AowtAy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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