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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bd8ce4a197ca7fb29d77d007e7096f70fbfcb4c27280673c5f4b2f9dd6ff6c' 
  AND token = 'ZnTQMv1jVLEFudrLqg6f38Dyl7izPMpAD5fj84MFZkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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