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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1e4fd3267ae01a90091ab963ef8ac6e8381090da305f774efd19cc7f234976' 
  AND token = 'dRY4PmXfbHN7N9iHzAM+Ibglx3Umw1ArDPddf5KQxFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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