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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff509b8825452f41a6cd431ff9f65e08aeb38e8c3702ee97f6f2dfda6970d84a' 
  AND token = 'sq1qI8GjktOJqTMVWpbaAThC/U9u+EkHGNR/8JaP1KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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