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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3618ecdcc44e5e9c4556fcbb56910c48b5ef06d396b6d5cdcd09802b09423ee' 
  AND token = 'aE5Wf5krT//n9o5KFm5Demz+G5L8iSnZ+od1i10FRIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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