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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7052e590550dfd07f48f0babb337f15261ed226575323f3b7693276321dd6342' 
  AND token = 'kqQC8chjdn9rPulQ2YQ/PoaXs887TmPYDZzumKvyauE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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