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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bae992aad915a8f5fd1d49596d6aeaff8bebf68ad1d1e1e60710f3d5e46484' 
  AND token = 'Sd1sgRZtP8IBMFxb3AHd5Lr7eMQqxDYxF+CNccvao8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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