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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5bc9d4d2013774929cd64e346681389b4e4a6eb886ec0e7954a4d93be267a2' 
  AND token = 'FFXFI8wGr5xJiOs0qV2Zy/I0ZvS/7q6ADceg5pnEX5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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