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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806a7a13a26126a1de3e11c466ec49e6e1764d89a970175393374a24be3f3f10' 
  AND token = '+HCBL62eNfpEWHjY/vJCI0O1Lpiu0uSOR9XWS1exp1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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