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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea93e43bffc212ffbdc0f3d0ff531e5edfca9124d691fc231cf026fb806e25f' 
  AND token = '+Kw2680ItEgbFq10F3I9NlO9nBf65xB7cekwhq5AOyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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