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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e5a798f8a1d7683b9e7aa2096fbced1f9dc79812a075a0c5a45ece697f1c8c' 
  AND token = 'h0TyB0T172bhRckEj/nhcSoS6YocBHh597s6+U18Foo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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