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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a08d6edee0e41f524cda5d55974e585b30cc21990f6f303ee50b7cda567e8bd' 
  AND token = 'Te49lNwBtvMg57csMDiIZdhpGYwnyHRG46w+Tys7g5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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