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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d9e9f544936d99abc082345c8a43a98193fec359f5a5364faef140ecf012d8' 
  AND token = 'tKZmpTccuGmrnL2R4CU3ao2j00UF5+4EJ88YhZWbeYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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