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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b00a4b2daeeab171a8f372d5263f858a3edde03b96f41acdb6eadc826e0b49' 
  AND token = '3y+msUhYBshT5l5dxSHP/+1G1/Kj47bkOQRHetT4q3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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