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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2e597864575662a7df6aca3e2cc22d1441ecf9e6e767a40cc0fd4e0cad9a7b' 
  AND token = 'vTT/BeMxJWYUgW5WzyV9T8eSgrQrxY7zA1wkUgRQDwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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