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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77623fbc6aab08702a09a8257a09a23d6e2d8ee67f16ebc53b592b50b56969e' 
  AND token = 'Wsz5uAkID0PwedFCor6yNg9NGjgfOkKxk9wX+M72UC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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