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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e75e17b2b15037615fcb328ae679411c4407a7573a03a10b8bcaff279718ac' 
  AND token = 'AVcYJAiQbQF2Ca0D2/bjsDQambHV3CWLbn121hJR9Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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