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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cf0902bc1ff1d73a886ebb07eb05a22a206096108f65b72ec8c330564d8abe' 
  AND token = 'QnET6W8GJJnV8BWQ2eqiEYDo347Y27fyullbFE5kMJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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