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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ba4a57ae818b469bdc82b60ce220e4b5be7b41164e8b9676e840f25a09007b' 
  AND token = 'tqe03CUxt9hFo0GvjvOcg15AwZNtNIvaTkv7uYIFFB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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