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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb0206cde0a0450c2adbcc7fb39f34e204dc2354234f19e66ceb9b18b2cf97d' 
  AND token = 'Bx7i0SXjOBDPVPknIFugDtyTzahrEiprTY8oDNDho/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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