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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd910f927c6a4c1a4fc43046d494723a43a02186ed9c690f3cc21f818e06e044b' 
  AND token = 'MEUCzyaR0y4fuNCf9YcpfF4yEn0tub4T41oZ103B2HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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