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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902c11057fef50b7c68533ca77d766317bf259ff40ae75a5761e5c09d8ee7a0c' 
  AND token = 'etAgFcoL5hK4xgZE0Lr6z50oIu5k9NkoXWQVu98b9mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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