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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa0f19ed297f07a797b605dc12259ea6bf915b9dbe9ac915e44f271338b0194' 
  AND token = 'qKbjLdwbYf+kE3YLtYk2DN85T2k1r5zfCOhmvMGDArQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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