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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614b9d0cf2a8695838af9f8ef4f32a901cb69a5e38e8f2f3a916a0c8ded017ab' 
  AND token = 'MhJeupCyh/678/SVugRWAixtKCrqHRkHlDhGXrHVL8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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