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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccd9e4dd67b49fa0c433993335c2b2d190430649be7bc1eedc9326650713647' 
  AND token = 'Agb3b+L/wG3Fb8mjNCqkNngRQy6lM/2S1wNI1wHx7Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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