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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc108912561d8b7aaf74fad31b193ff2003fa3570c0b9945c01421c572614ad3' 
  AND token = 'RKuC/dyLZr7UcAgVcN2rx3GW2WnpxNVNP098ETz/F0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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