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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d52df41479fb81bd5e88ca2d69470535be046d4e73aed1902022e9d368125a' 
  AND token = 'qvZw5eIT9wLM7w3U6JIWesPd4vfMRTL+DW+FZaWv6FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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