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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95438b18d84b6399e8ccddf39bbb5196440eee39ed73e29e66d35c8f191bf8b0' 
  AND token = 'h0oFz786kDjS7+4IzZk2RgCYI9ux87rG+1u5uHYjUnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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