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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0edb6e655a8aeea87c9a76b55fa701f422d88eff821d121ea109ebeff2f4cb8d' 
  AND token = '7juwWKpcaeqMUfmyo8dN1ZQG9Ze7LtkT/uZdviO33Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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